求高手指教！！

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct stu { char *name, gender; int score; }STU;
void f(char *p)
{ p=(char *)malloc(10);
strcpy(p, "Qian"); }
main()
{ STU a={NULL, 'm', 290}, b;
a.name=(char *)malloc(10); strcpy( a.name, "Zhao" );
b = a; f(b.name);
b.gender = 'f'; b.score = 350;
printf("%s,%c,%d,", a.name, a.gender, a.score);
printf("%s,%c,%d\n", b.name, b.gender, b.score);}
为什么通过 f(char *p)调用，b.name的值没发生改变？